When the kernel module is given the 'noaccel' option, but acceleration is not turned off in the x.org configuration, a confusing '-19' (ENODEV) error appears in the x.org logs. The patch at http://lists.freedesktop.org/archives/nouveau/2012-June/010523.html provides a more useful error message.
I don't think the bugtracker is the right place for patch submission. Doesn't look like it ever got checked in. You could try resending it and providing a fuller justification -- it's a bit odd to special-case a single error return. Documentation in e.g. the wiki may be a better way to go. (But I'm not the one accepting/rejecting the patches :) )
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